Diurnal foraging of a wild coral-reef fish Parapercis australis\n in relation to late-summer temperatures

T. J. Chase, J. P. Nowicki, Darren James Coker

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3 Scopus citations


In situ observations of diurnal foraging behaviour of a common site-attached shallow reef mesopredator Parapercis australis during late summer, revealed that although diet composition was unaffected by seawater temperature (range 28.3–32.4° C), feeding strikes and distance moved increased with temperature up to 30.5° C, beyond which they sharply declined, indicative of currently living beyond their thermal optimum. Diel feeding strikes and distance moved were however, tightly linked to ambient temperature as it related to the population's apparent thermal optimum, peaking at times when it was approached (1230 and 1700 hours) and declining up to four fold at times deviating from this. These findings suggest that although this population may be currently living beyond its thermal optimum, it copes by down regulating energetically costly foraging movement and consumption and under future oceanic temperatures, these behavioural modifications are probably insufficient to avoid deleterious effects on population viability without the aid of long-term acclimation or adaptation.
Original languageEnglish (US)
Pages (from-to)153-158
Number of pages6
JournalJournal of Fish Biology
Issue number1
StatePublished - Aug 30 2018

Bibliographical note

KAUST Repository Item: Exported on 2021-02-19
Acknowledgements: This research was funded by James Cook University and the ARC Centre of Excellence for Coral Reef Studies. This project was implemented in accordance with the Great Barrier Reef Marine Park Authority and James Cook University General Fisheries Permit (103256). We are grateful for the logistical support provided by staff at Lizard Island Research Station and guidance from S.P.W. Walker.


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